from .models import db, PackageType, Package, ForumTopic, License, MinetestRelease, PackageRelease, User, Tag
from .models import tags as Tags
from .utils import isNo, isYes
from sqlalchemy.sql.expression import func
from flask import abort
from sqlalchemy import or_

class QueryBuilder:
	title  = None
	types  = None
	search = None

	def __init__(self, args):
		title = "Packages"

		# Get request types
		types = args.getlist("type")
		types = [PackageType.get(tname) for tname in types]
		types = [type for type in types if type is not None]
		if len(types) > 0:
			title = ", ".join([type.value + "s" for type in types])

		# Get tags types
		tags = args.getlist("tag")
		tags = [Tag.query.filter_by(name=tname).first() for tname in tags]
		tags = [tag for tag in tags if tag is not None]

		# Hid
		hide_flags = args.getlist("hide")

		self.title  = title
		self.types  = types
		self.tags   = tags

		self.random = "random" in args
		self.lucky  = "lucky" in args
		self.hide_nonfree = "nonfree" in hide_flags
		self.limit  = 1 if self.lucky else None
		self.order_by  = args.get("sort")
		self.order_dir = args.get("order") or "desc"

		# Filters

		self.search = args.get("q")
		self.protocol_version = args.get("protocol_version")
		self.author = args.get("author")

		self.show_discarded = isYes(args.get("show_discarded"))
		self.show_added = args.get("show_added")
		if self.show_added is not None:
			self.show_added = isYes(self.show_added)

		if self.search is not None and self.search.strip() == "":
			self.search = None

	def setSortIfNone(self, name):
		if self.order_by is None:
			self.order_by = name

	def getMinetestVersion(self):
		if not self.protocol_version:
			return None

		self.protocol_version = int(self.protocol_version)
		version = MinetestRelease.query.filter(MinetestRelease.protocol>=self.protocol_version).first()
		if version is not None:
			return version.id
		else:
			return 10000000

	def buildPackageQuery(self):
		query = Package.query.filter_by(soft_deleted=False, approved=True)

		if len(self.types) > 0:
			query = query.filter(Package.type.in_(self.types))

		if self.search:
			query = query.search(self.search, sort=True)

		if self.random:
			query = query.order_by(func.random())
		else:
			to_order = None
			if self.order_by is None or self.order_by == "score":
				to_order = Package.score
			elif self.order_by == "created_at":
				to_order = Package.created_at
			else:
				abort(400)

			if self.order_dir == "asc":
				to_order = db.asc(to_order)
			elif self.order_dir == "desc":
				to_order = db.desc(to_order)
			else:
				abort(400)

			query = query.order_by(to_order)

		if self.author:
			author = User.query.filter_by(username=self.author).first()
			if not author:
				abort(404)

			query = query.filter_by(author=author)

		for tag in self.tags:
			query = query.filter(Package.tags.any(Tag.id == tag.id))

		if self.hide_nonfree:
			query = query.filter(Package.license.has(License.is_foss == True))
			query = query.filter(Package.media_license.has(License.is_foss == True))

		if self.protocol_version:
			version = self.getMinetestVersion()
			query = query.join(Package.releases) \
				.filter(PackageRelease.approved==True) \
				.filter(or_(PackageRelease.min_rel_id==None, PackageRelease.min_rel_id<=version)) \
				.filter(or_(PackageRelease.max_rel_id==None, PackageRelease.max_rel_id>=version))

		if self.limit:
			query = query.limit(self.limit)

		return query

	def buildTopicQuery(self, show_added=False):
		query = ForumTopic.query

		if not self.show_discarded:
			query = query.filter_by(discarded=False)

		show_added = self.show_added == True or (self.show_added is None and show_added)
		if not show_added:
			query = query.filter(~ db.exists().where(Package.forums==ForumTopic.topic_id))

		if self.order_by is None or self.order_by == "name":
			query = query.order_by(db.asc(ForumTopic.wip), db.asc(ForumTopic.name), db.asc(ForumTopic.title))
		elif self.order_by == "views":
			query = query.order_by(db.desc(ForumTopic.views))
		elif self.order_by == "date":
			query = query.order_by(db.asc(ForumTopic.created_at))
			sort_by = "date"

		if self.search:
			query = query.filter(ForumTopic.title.ilike('%' + self.search + '%'))

		if len(self.types) > 0:
			query = query.filter(ForumTopic.type.in_(self.types))

		if self.limit:
			query = query.limit(self.limit)

		return query